Re: image quality

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Rob Jenkins (robj++at++quid.engr.sgi.com)
Fri, 8 May 1998 12:00:08 -0700


On May 8, 2:34pm, A. Ballard Andrews wrote:
> Subject: image quality
> Hello Performers,
>
> Why do large RGB images look good in Performer
> (perfly) but crummy in Inventor (ivview)?
>
> A. Andrews
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
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>-- End of excerpt from A. Ballard Andrews

Inventor has an SoComplexity node ( see the man page for that node ) which has
a
'textureQuality' field. textureQuality defaults to 0.5, try adding a complexity
node before any texture2 nodes in your iv file and setting textureQuality to
one ( or at least > 0.8 should be better I think ) and see if ivview looks
better, so like:

        Complexity {
            type ~
            value ~
            textureQuality 1.0
        }
        Texture2 {
....

Also, if you're on Impact or OCTANE then you might be seeing a known thing
where Inventor uses MAX_TEXTURE_SIZE to see if a texture fits in TRAM, if it
doesn't then it shrinks it so you lose something in the filtering. This isn't
ideal and there's a way round it but it might not be what you describe, I can
give you more detail if it is.

Cheers
Rob

-- 
________________________________________________________________
Rob Jenkins mailto:robj++at++sgi.com
Silicon Graphics, Mtn View, California, USA
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